Process of increasing the binding power of basic silicates of lime.



STATES PATENT OFFICE.

WILHELM SCHUMACHER, OF OSNABR'O'CK, GERMANY.

PROCESS INCREASING THE BINDING POWER OF BASIC SILIGATES OF LIME.

No Drawing.

To all whom it may concern:

Be it known that I, WILHELM Sono- MACHER, chemist and subject of the King of Prussia, residing at Osnabriick, in the Kingdom of Prussia, German Empire, have invented a new and useful Improvement in the Process of Increasing the Binding Power of Basic Silicates of Lime, of which the following is a full, clear, and exact description.

It is known that by simply adding certain quantities of uartz owder of a mess similar to tlig g rnelllgllumgnfiibfi... mixt'fireof'oififiiart Portland cement and) 13130 arts sand the semi-8m. o y gr blocli oBIained is i creased. Of course, in this case no chemical action of the quartz upon cement takes place, but only a physical action. However, the effect of the addition of quartz owder gan be greatly increased if the cemen blocks are submitted to the action of steam under pressure preferably after the so 1 1 ying or y ra ion of the cement. As known, on the h dration of the cement lime is set free and it IS this latter whim,

on em rea e wit team com mes W1- 'e a e silica quartz to orm s1 mate of l1me,'w ere y e s rength of the cementblocks is very considerably increased. By a great number of trials it has been established that the greatest strengths result if to the cement so much quartz powder is added,

\that the e a er ogether with the silica of the cemen 1s approxima v qual to the' amount of lime. The most -avorable a 1t1on of silica or each kind of cement can easily be found by way of experiment.

It is well known that if a fine sand is l used in connection with cement, a reater amount of cement is necessary to orm a block than when coarser sand is used. This is necessitated because of the greater amount of sand surface caused by the division into fine particles. I have found, however, that by adding a certain proportion of owdered uartz a less amount of cement isnecessary,

"EEK what was formerly required to bind together the particles of a while at the same time a muc s ronger Of course instead of the Pgrtlang1 any other basic silicate of lime and particu- Specification of Letters Patent.

Patented Sept. 19, 1911.

larly blast furnace sla may be used. In usinfmnany cases preferable to add small quantities of lime in order to expedite the hydration or so cation.

The addition of quartz powder is also useful in the manufacture of slag stones, that is, articles made from granulated blast furnace slag, when such articles are hardened by steam. Even if no trace of ground slag is used, the addition of fine quartz powder to the granular slag will greatly enhance the effect of the steam treatment and increase the strength of the product.

The addition of quartz powder to basic silicates of lime is of particular importance in those cases in which it is desired to obtain the greatest possible strength with a minimum of binding material, 6. g., the ag- I glomeration of pulverulent ores (making 5 of briquets) ,where, by the addition of binding means the ore is rendered impure and reduced in value.

Of course it is possible to add to the basic silicates of lime, besides the quartz powder, 80 also other materials as used heretofore for certain purposes, for instance, lime,pgp'- sum as ahaltum stearin etc. i Wha I claim 1's" 1. The process herein described of increasing the binding power of basic silicates of lime, which consists in adding thereto fine quartz powder, the total amount of silicate present in the mixture thus formed not to exceed the amount of lime, and subjecting the total mass to the action of steam under pressure.

2. The method herein described of increasing the binding power of basic silicates of lime, which consists in adding thereto fine quartz powder, the total amount of silicate present in the mixture thus formed not to exceed the amount of lime, and also adding thereto other materials such as lime, gypsum, asphaltum and stearin, and subjecting the entire mass to the action of steam under pressure.

3. The method herein described of increasing the binding power of basic silicates of lime which consists in adding quartz powder thereto, the total amount of silicate present in the mixture thus formed not to exceed the amount of lime, forming the mass in the blocks and subjecting said blocks to the action of steam under pressure.

4. The process herein described of increasing the binding power of basic silicates of lime, which consists in adding thereto lime my name in the presence of two subscribing and fine quartz powder, the total amount of witnesses.

silica present in the mixture thus formed not I I to exceed the total amount of lime present VILHELM SCHUMAOHER' 5 therein, and subjecting the resulting mass to e Vitnesses;

the action of steam under pressure. FERDINAND REIOH,

In witness whereof, I have hereunto slgned FREDERICK HOYERMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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